palette diff tool

[ott/enhance] / core.c

diff --git a/core.c b/core.c
index 6e2928aebebc9dec8afe88e2d4a7b8cf9b713bcc..0a3d1c41da19d3670bb4bd1a238113063a1f8384 100644 (file)
--- a/core.c
+++ b/core.c
@@ -1,7 +1,7 @@
 /*
 core.c
 The tool with multiple enhancements and manipulations of pictures
-26.11.2022
+03.12.2022
 
 Copyright (C) 2014, 2015, 2022  Balthasar Szczepański
 
@@ -1561,6 +1561,67 @@ int palette_mix_index (ILuint n, struct PixelInfo *p, void *data)
        return 0;
 }
 
+ILuint tsqrt(ILuint s)
+{
+       switch(s)
+       {
+       case 256:
+               return 16;
+       case 225:
+               return 15;
+       case 196:
+               return 14;
+       case 169:
+               return 13;
+       case 144:
+               return 12;
+       case 121:
+               return 11;
+       case 100:
+               return 10;
+       case 81:
+               return 9;
+       case 64:
+               return 8;
+       case 49:
+               return 7;
+       case 36:
+               return 6;
+       case 25:
+               return 5;
+       case 16:
+               return 4;
+       case 9:
+               return 3;
+       case 4:
+               return 2;
+       case 1:
+               return 1;
+       default: // not a square - please fail
+               return 0;
+       }
+}
+
+//unsigned short isqrt(unsigned s)
+//{
+//      unsigned short r;
+//      unsigned short b=0x0040;
+//      
+//      while(b>s)
+//           b>>=2;
+//      while(b)
+//      {
+//           if(s>=r+b)
+//           {
+//                   s-=r+b;
+//                   r=(r>>1)+b;
+//           }
+//           else
+//                   r>>1;
+//           b>>2;
+//      }
+//      return r;
+//}
 
 
 // int action(